2001 Kentucky quarter errror?

is this a lamination or clad error on both sides. Coin looks different deem other 2001 quarters I’ve seen

 

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Missing Clad layer usually only happens on one side of a clad coin.. Not both

It's very likely Environmental Damage.
Niether is it any sort of Lamination

 

Here is an example from my collection -

 

Here are examples of clad affected by soil, dirt and the elements on both sides -
Not Mint Errors

 

Here is a picture with better lighting.

 

Looks like a normal clad quarter.

I see no copper, or 'color change' on
either side.